Eruption history
VEI – Volcanic Explosivity Index: 0 = lava outpouring, 4 = like Eyjafjallajökull 2010, 6 = like Pinatubo 1991, 7 = like Tambora 1815. The scale is logarithmic – each step is about 10 times more material.
| Start | End | VEI | Vent and dating |
|---|---|---|---|
| 9 December 2005 | 27 April 2006 | 3 | Observations: Reported |
| 27 March 1986 | 31 August 1986 | 4 | Observations: Reported |
| 22 January 1976 | 14 May 1977 | 4 | Observations: Reported |
| 7 October 1971 | 8 October 1971 | 1 | Observations: Reported |
| 11 October 1963 | 19 August 1964 | 2 | Observations: Reported |
| 13 March 1935 | 18 August 1935 | 3 | Observations: Reported |
| 2 July 1908 | — | 1 | Observations: Reported |
| 6 October 1883 | 2 July 1884 | 4 | Observations: Reported |
| 2 July 1812 | — | 3 | Observations: Reported |
| 1650 ± 100 years | — | ? | Correlation: Tephrochronology |
| 1540 ± 100 years | — | 4 | Isotopic: 14C (calibrated) |
| 1230 ± 50 years | — | ? | Isotopic: 14C (calibrated) |
| 930 ± 150 years | — | ? | Isotopic: 14C (calibrated) |
| 570 ± 150 years | — | ? | Isotopic: 14C (calibrated) |
| 340 ± 40 years | — | ? | Isotopic: 14C (calibrated) |
| 120 BCE ± 40 years | — | ? | Isotopic: 14C (calibrated) |
| 310 BCE ± 100 years | — | ? | Isotopic: 14C (calibrated) |
| 350 BCE ± 200 years | — | ? | Correlation: Tephrochronology |
| 1,820 BCE ± 300 years | — | ? | Isotopic: 14C (calibrated) |
| 2,040 BCE ± 300 years | — | ? | Isotopic: 14C (calibrated) |
| 4,150 BCE ± 100 years | — | ? | Isotopic: 14C (calibrated) |
| 5,420 BCE ± 50 years | — | ? | Isotopic: 14C (calibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#313010)